2007A&A...461..923O


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET20:42:46

2007A&A...461..923O - Astronomy and Astrophysics, volume 461, 923-929 (2007/1-3)

Constraining the spectral age of very asymmetric CSOs. Evidence of the influence of the ambient medium.

ORIENTI M., DALLACASA D. and STANGHELLINI C.

Abstract (from CDS):

We constrain the spectral ages for two very asymmetric Compact Symmetric Objects (CSO) from the B3-VLA-CSS sample, and we investigate the role of the ambient medium potentially able to influence the individual source evolution. Multi-frequency VLBA observations have been carried out to study the distribution of the break frequency of the spectra across different regions of each source. From the analysis of synchrotron spectra and assuming an equipartition magnetic field, we find radiative ages of about 5x103 and 5x104 years for B0147+400 and B0840+424, respectively. The derived individual hot-spot advance speed is in the range between 0.03c and 0.3c, in agreement with kinematic studies carried out on other CSOs. The very asymmetric morphology found in both sources is likely related to an inhomogeneous ambient medium in which the sources are growing, rather than to different intrinsic hot-spot pressures on the two sides.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: evolution - radio continuum: galaxies - radiation mechanisms: non-thermal - galaxies: ISM

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 49 rG 01 41 09.10 +13 53 28.0   22.327 20.920 20.876   ~ 175 1
2 NVSS J015019+401730 Rad 01 50 19.6 +40 17 30           ~ 13 1
3 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 473 2
4 ICRF J084331.6+421529 G 08 43 31.6374558 +42 15 29.524878           ~ 33 1
5 ICRF J092703.0+390220 Sy1 09 27 03.0139516273 +39 02 20.847968628   17.17 17.00 16.486   ~ 937 1
6 3C 268.3 Sy1 12 06 24.70656 +64 13 36.8760   21.847 20.790 19.910   ~ 182 1
7 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 538 3

    Equat.    Gal    SGal    Ecl

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2021.03.04-20:42:46

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